YSI 5000 - Manual (Page 58)

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Code/Problem Error
Possible Cause Correction
E4: Check
Membrane
DO High Current Membrane too thin Try another membrane
Electrodes need
resurfacing
Repair or replace
Internal leakage in
probe or cable
connector Repair or replace
Short circuit in probe or
cable Repair or replace
E5: Check
Membrane
DO unstable Membrane damaged Replace membrane
Probe needs servicing See probe instructions
Connector improperly
installed
Check probe connection
Intermittent connection
in cable or plug
Repair or replace
Probe malfunction Repair or replace
ERROR: DO reading < min. DO The DO reading at the start of the OUR or SOUR
measurement is below the “minimum beginning
DO” entered in the OUR or SOUR setup.
See 7.2 Application Mode, OUR, or SOUR.
ERROR: Illegal value The value entered is
outside the acceptable
range. Enter the correct value
ERROR: RTC defect control
register Real time clock failure Return for repair
ERROR: Init. Logger failed Logger initialization
failed Return for repair